Wind turbine structure



FIG. 1 is a perspective view of a wind turbine structure showing our new design;

FIG. 2 is a second perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front elevation view thereof;

FIG. 6 is a back elevation view thereof;

FIG. 7 is a cross-sectional view thereof taken along line 7-7 of FIG. 3; and,

FIG. 8 is a left side view thereof, the right side view being a mirror image of the left side view.

The broken lines shown represent unclaimed subject matter and form no part of the claimed design. 

CLAIM The ornamental design for a wind turbine structure, as shown and described. 